Detroit Free Press journalist Robert Allen sifts through these advertising fossils, exposing the gripping stories connected to the Motor City's historic rises, falls and eccentricities. Across Detroit, fleeting symbols of the past hide in plain sight, behind weeds and under veneers of paint. Demolishing a vacant building among empty storefronts on the west side uncovered the telltale gold and green of a Vernors Ginger Ale sign,...